<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>双飞翼</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    .page{
      height: 200px;
    }
    .left, .right{
      width: 200px;
      height: 200px;
      background: #0ce130;
    }
    .content{
      height: 200px;
      background: pink;
      width: 100%;
    }
    .inner{
      margin: 0 200px;
      height: 100%;
    }
    .page > div{
      float: left;
    }
    .left{
      margin-left: -100%;
    }
    .right{
      margin-left: -200px;
      /* margin-right: 200px; */
    }
  </style>
</head>
<body>
  <div class="page">
    <div class="content">
      <div class="inner">主要内容</div>
    </div>
    <div class="left">广告位</div>
    <div class="right">广告位</div>
  </div>
</body>
</html>